- Correspondence to Professor Dirkje S Postma, University of Groningen, University Medical Center Groningen, Department of Pulmonary Medicine and Tuberculosis, GRIAC Research Institute, AA11, Hanzeplein, PO Box 30001, Groningen 9700 RB, The Netherlands;
- Received 28 April 2014
- Revised 16 July 2014
- Accepted 14 August 2014
- Published online 13 October 2014.
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